I'm sure some of you have seen or heard about a brutal call that was made by the Hawk-eye system, which I had previously blogged about here as well as other associated posts, during the match between Andy Murray and Ivan Ljubibic.
If not, here is a link to the youtube video.
Even though the ball was clearly out, it was called in by the Hawk-eye system.
The following link is an explanation of what happened from Hawk-eye.
Quickly summarized, this was what was shown on the both the video boards and tv.
The system showed the second bounce, which happened to be on the line. Instead, this was what really happened.
This mistake was partly due to an error by the operator who is responsible for displaying the correct bounce mark, but the system has also been modified as a result of this incident to ensure that the operator always goes to the correct bounce mark, and prevent this happening again.